All welcome. As welded profile pipes? This is probably the most to a question of all questions for beginners in welding! Nowadays profiled tube has become the most marketable material for welding different designs - both at home and in the production of serious and dimensional metal products.
But we as newcomers interesting welding shaped tube for its domestic needs. For houses, cottages, we need to make a fence, outside shower, toilet, ladder, garden furniture, doors and more. What are the positive and negative sides of the profile of the pipe? From the good - it is easy and inexpensive, very easy to make this material a variety of designs. From the negative - are very thin material and at home, most are used pipe thickness of 1.5 - 2 mm, 3mm rarely. Therefore, once the beginner will not be easy to cook these pipes have to try and well cooked and not burn through the tube.
Therefore, I try to give useful tips to help master the weld profile pipes. First Things First measure twice and cut once. In fact, try as closely as possible to measure the size of the desired piece and cut it exactly in size. Therefore, try to use the things that produce the most fine line marking on the metal. Forget the chalk! Personally, I also do not like to use a marker to mark - his line is too thick, a few mm will be exactly, or metal scriber or indelible pencil, I choose a pencil, mark up all the blue for many years by chemical pencil.
The Council should - vari electrodes with rutile, welding is a frequent separation and ignition, for these purposes only rutile - this is the most common (at least ours) MR-3C, ANO-21 Monolith. When cut off and grabbed the workpiece to the workpiece, it is necessary to arrange a smoke break! Will cook with a margin, as the metal is thin. But the current will exhibit an increased thickness for this, everlasting - optimum welding current directly at the beginner is hardly happen, it will come with time. On a small current will often sticky and can neprovarivat both edges of the pipe. So bolder more current still cook with frequent margin, but it will certainly be boiled thoroughly pipe edge, do not be afraid to burn - it brewed.
Once grabbed the workpiece, make Yeshe tack between the first tack, you could even instruct these tack every 12 cm, once again - it is only for advice just starting, with so many tacks budel easier welding metal pipe does not burn, because in place of potholders metal thickness is considerable, and there are a lot of tack and welding will easier. According to the theory you need to cook on reverse polarity, ie + on derzhak. Before you start cooking a basic design and disposition current practice on unnecessary zhelezjaki the same thickness obtained starts - boil the main conduit. Another tip - not necessarily in a row to go to cook, even better would be to do so - I put a little shovchik first junction - take the next small shovchik at the end of the joint. then in the middle and so can vrazbezhku (small shovchik - this I mean a few consecutive points made with a margin). So you can do in all positions welding. Another tip - try to keep the arc as short as possible - short arc heats the metal is less than the length and the smaller the metal splash.
If the connection is T-bar, all the same, only need arc almost entirely directed to the basic whole tube, and the ends of the severed pipe capture arc barely - barely, just a stroke end of the pipe burns, when you direct the welding arc to it, so I try to do it gently and barely touching. But there also needs to be trained on an unnecessary piece of iron of the same thickness with the same example of the joint.
Well, perhaps all my counsel, to start would be enough, more practicing on unnecessary piece of iron, do not regret the time and the electrodes, it all pay off in the future.